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This project aims to evaluate if after 14 days of grape juice ingestion there is improvement of the parameters of strength, fatigue and oxidative stress in judo fighters. The study will be a randomized, blind, crossover clinical trial of 20 Judo athletes. Judo wrestling simulations will be performed on 3 different days.
Grape juice has a high concentration of phenolic compounds and is capable of modulating biochemical parameters and oxidative stress. By naturally containing carbohydrates grape juice can help acutely minimize fatigue during exercise as well as long-term oxidative stress parameters in athletes. This project aims to evaluate if after 14 days of grape juice ingestion there is improvement of the parameters of strength, fatigue and oxidative stress in judo fighters. The study will be a randomized, blind, crossover clinical trial of 20 Judo athletes. Judo wrestling simulations will be performed on 3 different days. Each exercise session will consist of four 7-minute bouts, with 14-minute rest between them. The athletes will perform a first fight simulation without ingestion of any beverage (control group 1), and then will be randomized to determine the order of participation in the groups: maltodextrin (group 2 placebo) and grape juice (intervention group 3). Analyzes of oxidative stress; Muscle strength and fatigue; Perceived effort rate; Lactate; Heart rate; Analysis of food consumption and body composition.Two-way ANOVA will be used to evaluate the relation of the intervention and physical exercise, besides parameters of strength and fatigue. The level of significance adopted will be 5% and for the analysis, the SPSS summer 23 statistical program will be used.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Control Group | No Intervention | The athletes will not receive any drink and will do the simulations of the fight. | |
| Intervention group | Active Comparator | (Intervention, grape juice) - athletes will receive 400 ml per day of grape juice (containing 66g of carbohydrates) for 14 days and will do the fight simulations. |
|
| Placebo Group | Placebo Comparator | (Placebo, grape-flavored maltodextrin carbohydrate) - athletes will receive400ml of drink daily with 66g of maltodextrin for 14 days and will do the fight simulations; The amount of maltodextrin is equal to the amount of carbohydrate present in grape juice. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Grape juice | Dietary Supplement | 400ml diary of grape juice |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Oxidative stress In Blood Collection | A disturbance in the prooxidant-antioxidant balance in favor of the former, leading to potential damage. | 15 days |
| Measure | Description | Time Frame |
|---|---|---|
| Borg in scale. | Specific to muscle fatigue, a state arrived at through prolonged and strong contraction of a muscle. Studies in athletes during prolonged submaximal exercise have shown that muscle fatigue increases in almost direct proportion to the rate of muscle glycogen depletion. Muscle fatigue in short-term maximal exercise is associated with oxygen lack and an increased level of blood and muscle lactic acid, and an accompanying increase in hydrogen-ion concentration in the exercised muscle. |
| Measure | Description | Time Frame |
|---|---|---|
| Lactate in numbers | Specific to muscle fatigue, a state arrived at through prolonged and strong contraction of a muscle. Studies in athletes during prolonged submaximal exercise have shown that muscle fatigue increases in almost direct proportion to the rate of muscle glycogen depletion. Muscle fatigue in short-term maximal exercise is associated with oxygen lack and an increased level of blood and muscle lactic acid, and an accompanying increase in hydrogen-ion concentration in the exercised muscle. |
Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Cláudia Dornelles Schneider | Federal University of Health Science of Porto Alegre | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Cláudia Dornelles Schneider | Porto Alegre | Rio Grande do Sul | Brazil |
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Randomized clinical trial
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Double blind study
| Maltodextrin |
| Dietary Supplement |
400ml diary of maltodextrin |
|
| 15 days |
| 15 days |
| Upper and lower limb strength in repetitions or numbers in meters | Specific to muscle fatigue, a state arrived at through prolonged and strong contraction of a muscle. Studies in athletes during prolonged submaximal exercise have shown that muscle fatigue increases in almost direct proportion to the rate of muscle glycogen depletion. Muscle fatigue in short-term maximal exercise is associated with oxygen lack and an increased level of blood and muscle lactic acid, and an accompanying increase in hydrogen-ion concentration in the exercised muscle. | 15 days |
| Palmar grip strength - in strength and time | Specific to muscle fatigue, a state arrived at through prolonged and strong contraction of a muscle. Studies in athletes during prolonged submaximal exercise have shown that muscle fatigue increases in almost direct proportion to the rate of muscle glycogen depletion. Muscle fatigue in short-term maximal exercise is associated with oxygen lack and an increased level of blood and muscle lactic acid, and an accompanying increase in hydrogen-ion concentration in the exercised muscle. | 15 days |
| muscle pain | Specific to muscle fatigue, a state arrived at through prolonged and strong contraction of a muscle. Studies in athletes during prolonged submaximal exercise have shown that muscle fatigue increases in almost direct proportion to the rate of muscle glycogen depletion. Muscle fatigue in short-term maximal exercise is associated with oxygen lack and an increased level of blood and muscle lactic acid, and an accompanying increase in hydrogen-ion concentration in the exercised muscle. | 15 days |
| ID | Term |
|---|---|
| C008315 | maltodextrin |
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